Water-cooling type battery cooling system and cooling method using the same

ABSTRACT

A water-cooling type battery cooling system and a cooling method using the same are provided. The water-cooling type battery cooling system cools a battery using an air conditioner system. The air conditioner system includes a refrigerant circuit to improve control of cooling discharge temperature provided therein

CROSS-REFERENCE(S) TO RELATED APPLICATIONS

This application claims priority to Korean Patent Application No(s).10-2018-0085912, filed on Jul. 24, 2018, the disclosure of which isincorporated herein by reference in its entirety.

BACKGROUND Field of the Disclosure

The present disclosure relates to a water-cooling type battery coolingsystem and a cooling method using the same, and more particularly, to awater-cooling type battery cooling system for cooling a battery using anair conditioner system, which includes a refrigerant circuit forimproving control of cooling discharge temperature, and a cooling methodusing the same.

Description of Related Art

Generally, a water-cooling type battery cooling system for cooling abattery using an air conditioner system has a configuration in which arefrigerant circuit of an air conditioner system is connected to achiller. FIG. 1 illustrates an air conditioner system in which aconventional water-cooling type battery cooling system is provided,according to the related art, and FIG. 2 illustrates the conventionalwater-cooling type battery cooling system according to the related art.

In particular, the system shown in FIGS. 1 and 2 show insufficient spacein an engine compartment and deterioration of the assembly abilitycaused by an increase of electrical parts due to the complex refrigerantcircuit branch structure. Additionally, cost, weight and the like areincreased in such systems. When a refrigerant of the air conditionersystem is supplied to a chiller for cooling a battery during operationof the air conditioner for cooling a vehicle indoor space, an indoorvent discharge temperature increases due to deterioration of the flowamount distribution of the refrigerant, thereby deteriorating thecomfort. Therefore, it may be difficult to control a cooling dischargetemperature thus leading to deterioration of indoor space coolingperformance.

SUMMARY

The present disclosure optimizes an internal space in an enginecompartment by integrating a refrigerant circuit of an air conditionersystem for cooling an indoor space and a refrigerant circuit for achiller which is branched from the refrigerant circuit of the airconditioner system and further connected for cooling the battery. Inaddition, an object of the present disclosure is to prevent suddenchange in a flow amount distribution of a refrigerant, when a battery iscooled.

In order to achieve the above objects, a water-cooling type batterycooling system according to the present disclosure may include acompressor into which a refrigerant in an evaporator may flow through asuction pipe directly connected to the compressor, a chiller configuredto cool a battery and a thermostatic expansion valve for the chiller maybe mounted on a certain longitudinal portion of the suction pipe toallow an internal refrigerant of the suction pipe discharged from theevaporator to pass sequentially through the thermostatic expansion valvefor the chiller and the chiller and to subsequently flow into thecompressor along the suction pipe, and the refrigerant discharged fromthe condenser may flow in a liquid pipe having a first end connected tothe condenser and a second end connected to the suction pipe between thethermostatic expansion valve for the chiller and the evaporator.

The chiller may include a chiller suction inlet port into which theinternal refrigerant of the suction pipe may flow, a chiller liquidinlet port into which an internal refrigerant of the liquid pipe mayflow, and a refrigerant outlet port through which an internalrefrigerant of the chiller entered through the chiller suction inletport and the chiller liquid inlet port may be discharged. The chillersuction inlet port and the refrigerant outlet port may be coaxiallyformed to each other. The thermostatic expansion valve for the chillermay include a valve suction inlet port into which the internalrefrigerant of the suction pipe may flow, and a valve liquid inlet portinto which the internal refrigerant of the liquid pipe may flow. Inparticular, the valve suction inlet port may be in communication withthe chiller suction inlet port, and the valve liquid inlet port may bein communication with the chiller liquid inlet port.

The liquid pipe may be in communication with the valve liquid inlet portat a certain longitudinal portion thereof. The thermostatic expansionvalve for the chiller may include a solenoid valve mounted therein andconfigured to open or close the valve liquid inlet port. The solenoidvalve may have an orifice aperture formed therein. The solenoid valvemay be changed to an opened state when a turn-on signal is transmittedto the chiller and may be changed to a closed state when the turn-offsignal is transmitted to the chiller. When the turn-off signal istransmitted to the chiller, the internal refrigerant of the liquid pipemay flow towards the suction pipe connected to the second end of theliquid pipe.

As the solenoid valve is opened when the turn-on signal is transmittedto the chiller, the internal refrigerant of the liquid pipe may bedivided, and some of the divided refrigerant may flow towards the valveliquid inlet port and flow into the chiller. When the turn-on signal istransmitted to the chiller, the internal refrigerant of the liquid pipeflowing into the chiller may be circulated in the chiller andheat-exchanged to cool coolant for a battery in the chiller. The chillermay include a partition installed therein to close a space between thechiller suction inlet port and the refrigerant outlet port.

The internal refrigerant of the suction pipe flowing into the chillervia the chiller suction inlet port may be circulated in the chiller andheat-exchanged to cool coolant for a battery in the chiller. The chillermay include a coolant inlet port and a coolant outlet port formedtherein. When the turn-on signal is transmitted to the chiller, coolantfor a battery may flow into the coolant inlet port and may be dischargedfrom the coolant outlet port.

According to another aspect of the present disclosure, a cooling methodusing the water-cooling type battery cooling system according to thepresent disclosure may include transmitting a turn-on signal to achiller for cooling a battery; opening a valve liquid inlet port byoperation of a solenoid valve mounted in a thermostatic expansion valvefor the chiller; dividing an internal refrigerant of a liquid pipe toallow some of divided refrigerant to be directed towards the valveliquid inlet port and to flow into the chiller; circulating the internalrefrigerant of the liquid pipe flowing into the chiller to beheat-exchanged and to cool coolant for the battery in the chiller; anddischarging the internal refrigerant of the liquid pipe, which hascooled coolant for the battery in the chiller, via a refrigerantdischarge port.

Prior to transmitting the turn-on signal to the chiller and up to thedischarging of the internal refrigerant of the liquid pipe to theoutside of the chiller via the refrigerant outlet port, the internalrefrigerant of the suction pipe, which passes sequentially through thechiller suction inlet port and the refrigerant outlet port, may flowinto the chiller. Additionally, prior to transmitting the turn-on signalto the chiller, the valve liquid inlet port may be in a closed state bythe solenoid valve.

Prior to opening the valve liquid inlet port, the internal refrigerantof the liquid pipe discharged from a condenser may flow towards thesuction pipe connected to the second end of the liquid pipe. Indischarging of the internal refrigerant of the liquid pipe to theoutside of the chiller via the refrigerant outlet port, the internalrefrigerant of the liquid pipe may be coalesced with the internalrefrigerant of the suction pipe in the chiller and may be thendischarged to the outside of the chiller. The internal refrigerant ofthe liquid pipe discharged to the outside of the chiller may flow into acompressor.

According to the present disclosure, by integrating the refrigerantcircuit of the air conditioner system and the refrigerant circuit forthe chiller, the structure may be simplified compared to the existingsystem, and thus the internal space of the engine compartment may beoptimized. Further, the cost and weight may be reduced and the assemblyability may be improved. In addition, it may be possible to solve theproblem caused by a sudden change in the flow amount distribution of therefrigerant, which has been a problem in cooling the battery in theconventional air conditioner system, thereby improving the indoorcomfort and satisfaction by securing a stability of the indoor ventdischarge temperature control.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features of the present invention will now bedescribed in detail with reference to certain exemplary embodimentsthereof illustrated the accompanying drawings which are givenhereinbelow by way of illustration only, and thus are not limitative ofthe present invention, and wherein:

FIG. 1 is a view showing an air conditioner system in which aconventional water-cooling type battery cooling system is providedaccording to the related art;

FIG. 2 is a view showing the conventional water-cooling type batterycooling system according to the related art;

FIG. 3 is a view showing an air conditioner system in which awater-cooling type battery cooling system according to an exemplaryembodiment of the present disclosure is provided;

FIG. 4 is a view showing the water-cooling type battery cooling systemaccording to an exemplary embodiment of the present disclosure;

FIG. 5 is a view illustrating a refrigerant circulating configuration ina refrigerant circuit for a chiller when a chiller is turned-offaccording to an exemplary embodiment of the present disclosure;

FIG. 6 is a conceptual view of an entire system illustrated in FIG. 5according to an exemplary embodiment of the present disclosure;

FIG. 7 is a view illustrating the refrigerant circulating configurationin the refrigerant circuit for the chiller when the chiller is turned-onaccording to an exemplary embodiment of the present disclosure;

FIG. 8 is a conceptual view of an entire system illustrated in FIG. 7according to an exemplary embodiment of the present disclosure;

FIG. 9 is a structural view of the chiller according to an exemplaryembodiment of the present disclosure;

FIG. 10 shows the chiller according to a first exemplary embodiment ofthe present disclosure and is a cross-sectional view taken along lineA-A of FIG. 9; and

FIG. 11 shows the chiller according to a second exemplary embodiment ofthe present disclosure and is a cross-sectional view taken along lineA-A of FIG. 9.

DETAILED DESCRIPTION

It is understood that the term “vehicle” or “vehicular” or other similarterm as used herein is inclusive of motor vehicles in general such aspassenger automobiles including sports utility vehicles (SUV), buses,trucks, various commercial vehicles, watercraft including a variety ofboats and ships, aircraft, and the like, and includes hybrid vehicles,electric vehicles, plug-in hybrid electric vehicles, hydrogen-poweredvehicles and other alternative fuel vehicles (e.g. fuels derived fromresources other than petroleum). As referred to herein, a hybrid vehicleis a vehicle that has two or more sources of power, for example bothgasoline-powered and electric-powered vehicles.

Although exemplary embodiment is described as using a plurality of unitsto perform the exemplary process, it is understood that the exemplaryprocesses may also be performed by one or plurality of modules.Additionally, it is understood that the term controller/control unitrefers to a hardware device that includes a memory and a processor. Thememory is configured to store the modules and the processor isspecifically configured to execute said modules to perform one or moreprocesses which are described further below.

Furthermore, control logic of the present disclosure may be embodied asnon-transitory computer readable media on a computer readable mediumcontaining executable program instructions executed by a processor,controller/control unit or the like. Examples of the computer readablemediums include, but are not limited to, ROM, RAM, compact disc(CD)-ROMs, magnetic tapes, floppy disks, flash drives, smart cards andoptical data storage devices. The computer readable recording medium canalso be distributed in network coupled computer systems so that thecomputer readable media is stored and executed in a distributed fashion,e.g., by a telematics server or a Controller Area Network (CAN).

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting of the disclosure.As used herein, the singular forms “a”, “an” and “the” are intended toinclude the plural forms as well, unless the context clearly indicatesotherwise. It will be further understood that the terms “comprises”and/or “comprising,” when used in this specification, specify thepresence of stated features, integers, steps, operations, elements,and/or components, but do not preclude the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or groups thereof. As used herein, the term “and/or”includes any and all combinations of one or more of the associatedlisted items.

In order to fully understand the present disclosure, exemplaryembodiments of the present disclosure will be described with referenceto the accompanying drawings. The exemplary embodiments of the presentdisclosure may be modified in various forms, and the scope of thepresent disclosure should not be construed as being limited to theexemplary embodiments described in detail below. The present exemplaryembodiments are provided to enable those ordinary skilled in the art tomore fully understand the present disclosure. Therefore, shapes and thelike of elements in the drawings may be exaggerated in order toemphasize clearer explanation. It should be noted that the same elementsin the drawings are denoted by the same reference numeral. Detaileddescriptions on well-known functions and configurations that mayunnecessarily obscure the gist of the present disclosure will beomitted.

The present disclosure relates to a water-cooling type battery coolingsystem and a cooling method using the same, and more particularly, to acooling system, in which a refrigerant circuit for enhancing cooling anddischarge temperature control is provided, in a water-cooling batterycooling system for cooling a battery using an air conditioner system,and a cooling method using the same.

In FIG. 3, an air conditioner system in which a water-cooling typebattery cooling system according to the present disclosure is providedis illustrated. The water-cooling type battery cooling system of thepresent disclosure for cooling coolant using a refrigerant of an airconditioner system may include an evaporator 2, a compressor 4 and acondenser 6 having a refrigerant circuit of the air conditioner systemto cool a vehicle indoor space and a refrigerant circuit for a chillerto cool a battery, which are integrally formed with each other.

The water-cooling type battery cooling system may further include aliquid pipe 26 together with a chiller 10 to which a suction pipe 8separated from a battery coolant line may be connected. In particular, arefrigerant of the air conditioner system may flow from the evaporator 2to the compressor through the suction pipe. A refrigerant dischargedfrom the condenser 6 may flow in the liquid pipe 26, and thisrefrigerant may be discharged from the condenser 6 and flow in theliquid pipe 26, and the liquid pipe 26 may divide the flow amount ofrefrigerant into the flow amount of refrigerant entering the compressor4 via the chiller 10 and the flow amount of refrigerant entering theevaporator 2 without passing through the chiller 10.

Specifically, in the water-cooling type battery cooling system of thepresent disclosure, the evaporator 2 and the compressor 4 may beconnected to each other via the suction pipe 8 directly connectedthereto, and an internal refrigerant of the evaporator 2 may flow intothe compressor 4 through the suction pipe 8. The chiller 10 for coolinga battery and a thermostatic expansion valve 24 for the chiller may bemounted on a particular longitudinal portion of the suction pipe 8. Thesuction piping 8 may be in communication with the chiller 10 and thethermostatic expansion valve 24 for the chiller. An internal refrigerantof the suction pipe 8 discharged from the evaporator 2 may pass throughsequentially the thermostatic expansion valve 24 for the chiller and thechiller 10, and subsequently may flow into the compressor 4 along thesuction pipe 8.

A first end of the liquid pipe 26 may be connected to the condenser 6and a second end of the liquid pipe 26 may be connected to the suctionpipe 8. A location where the liquid pipe 26 is connected to the suction8 may be between the thermostatic expansion valve 24 for the chiller andthe evaporator 2. The refrigerant discharged from the condenser 6 mayflow along the liquid pipe 26 and flow into the suction pipe 8. Aninternal refrigerant of the liquid pipe 26 flowing into the suction pipe8 may be coalesced with the internal refrigerant of the suction pipe 8.

The chiller 10 for cooling the battery may include a chiller suctioninlet port 12 into which the internal refrigerant of the suction pipe 8may flow, a chiller liquid inlet port 14 into which the internalrefrigerant of the liquid pipe 26 may flow, and a refrigerant outletport 16 through which an internal refrigerant of the chiller 10 enteredthrough the chiller suction inlet port 12 and the chiller liquid inletport 14 may be discharged. The chiller suction inlet port 12 and therefrigerant outlet out 16 may be coaxially formed with each other, andthe refrigerant outlet port 16 may be connected to the suction pipe 8that extends toward the compressor 4.

In addition, a coolant inlet port 20 and a coolant outlet port 22 may beformed in the chiller 10. Particularly, when a turn-on signal istransmitted to the chiller 10, coolant for cooling the battery may flowinto the coolant inlet port 20 and may be discharged from the coolantoutlet port 22. The thermal expansion valve 24 for the chiller mayinclude a valve suction inlet port (not shown) into which the internalrefrigerant of the suction pipe 8 may flow and a valve liquid inlet port(not shown) into which the internal refrigerant of the liquid pipe 26may flow. The valve suction inlet port may be in communication with andcoaxially formed with the chiller suction inlet port 12, and the valveliquid inlet port may be in communication with and coaxially formed withthe chiller liquid inlet port 14.

The valve suction inlet port may be connected to the suction pipe 8 thatextends from the evaporator 2. The liquid pipe 26 may be formed to be incommunication with the valve liquid inlet port at a particularlongitudinal portion thereof. A solenoid valve 28 may providecommunication between the liquid pipe 26 and the valve liquid inletport. In particular, the solenoid valve 28 may be mounted in thethermostatic expansion valve 24 for the chiller, and the valve liquidinlet port may be opened or closed by operation of the solenoid valve 28to control a communication between the liquid pipe 26 and the valveliquid inlet port. The solenoid valve 28 in which an orifice aperture isformed may be changed to an opened state when the turn-on signal istransmitted to the chiller 10, and may be changed to a closed state whena turn-off signal is transmitted to the chiller 10.

FIG. 5 is a view illustrating a refrigerant circulating configuration ina refrigerant circuit for the chiller when the chiller is turned-off,and FIG. 6 illustrates a conceptual view of an entire system illustratedin FIG. 5. When the turn-off signal is transmitted to the chiller 10,the solenoid valve 28 may be maintained in a closed state, and thus, theliquid pipe 26 is not in communication with the valve liquid inlet port.Accordingly, the internal refrigerant of the liquid pipe 26 is notdivided and does not flow into the valve liquid inlet port side, andthus may flow towards the suction pipe 8 connected to the second end ofthe liquid pipe 26. At this time, a double pipe structure of the suctionpipe 8 allows the refrigerant discharged from the liquid pipe 26 to flowtowards the evaporator 2 without being mixed with the flow ofrefrigerant flowing from the evaporator 2 to the compressor 4.

FIG. 7 is a view illustrating the refrigerant circulating configurationin the refrigerant circuit for the chiller when the chiller isturned-on, and FIG. 8 is a conceptual view of an entire systemillustrated in FIG. 7. As the solenoid valve 28 is opened when theturn-on signal is transmitted to the chiller 10, the liquid pipe 26 isin communication with the valve liquid inlet port. Accordingly, theinternal refrigerant of the liquid pipe 26 may be divided, a firstportion of divided refrigerant may flow into the chiller 10 via thevalve liquid inlet port and the chiller liquid inlet port 14, and asecond portion of divided refrigerant may flow towards the suction pipe8 connected to the second end of the liquid pipe 26.

FIG. 9 shows a structural view of the chiller of the present disclosure,and FIG. 10 shows the chiller according to a first exemplary embodimentof the present disclosure and is a cross-sectional view taken along lineA-A of FIG. 9. When the chiller 10 of the present disclosure has a crosssection as illustrated in FIG. 10, the internal refrigerant of thesuction pipe 8 flowing into the chiller 10 through the chiller suctioninlet port 12 is not circulated in the chiller 10, but may be dischargedinto the suction pipe 8, connected to the compressor 4, through therefrigerant outlet port 16. At this time, when the turn-on signal istransmitted to the chiller 10, the internal refrigerant of the liquidpipe 26 flowing into the chiller 10 through the chiller liquid inletport 14 may be circulated in the chiller 10 and heat-exchanged to coolcoolant for the battery in the chiller 10.

FIG. 11 shows the chiller according to a second exemplary embodiment ofthe present disclosure and is a cross-sectional view taken along lineA-A of FIG. 9. When a partition 18 that closes a space between thechiller suction inlet port 12 and the refrigerant outlet port 16 isprovided in the chiller 10 of the present disclosure as illustrated inFIG. 11, the internal refrigerant of the suction pipe 8 flowing into thechiller 10 through the chiller suction inlet port 12 is not directlydischarged through the refrigerant outlet port 16, but may be circulatedin the chiller 10 and heat-exchanged to cool coolant for the battery inthe chiller 10. When the turn-on signal is transmitted to the chiller10, the internal refrigerant of the liquid pipe 26 flowing into thechiller 10 through the chiller liquid inlet port 14 may be coalescedwith the internal refrigerant of the suction pipe 8 in the chiller 10,and may be circulated in the chiller 10 and heat-exchanged to coolcoolant for the battery in the chiller 10.

The cooling method using the water-cooling type battery cooling systemof the present disclosure configured as described above disclosure mayinclude transmitting a turn-on signal to the chiller 10 for cooling thebattery; operating the solenoid valve 28 mounted in the thermostaticexpansion valve 24 for the chiller to open the valve liquid inlet port;dividing the internal refrigerant of the liquid pipe 26 to allow a firstportion of divided refrigerant to be directed towards the valve liquidinlet port and to flow into the chiller; circulating the internalrefrigerant of the liquid pipe 26 flowing into the chiller 20 to beheat-exchanged and to cool coolant for the battery in the chiller 10;and discharging the internal refrigerant of the liquid pipe 26, whichhas cooled coolant for the battery in the chiller 10, via therefrigerant discharge port 16.

Before the turn-on signal is transmitted to the chiller 10, the valveliquid inlet port may be maintained in a closed state by the solenoidvalve 28, and the internal refrigerant of the liquid pipe 26 dischargedfrom the condenser 6 may flow towards the suction pipe 8 connected tothe second end of the liquid pipe 26. When the turn-on signal istransmitted to the chiller 10 to cool the battery, the solenoid valve 28may be operated to allow the valve liquid inlet port to be incommunication with the liquid pipe 26.

As the valve liquid inlet port becomes in communication with the liquidpipe 26, the internal refrigerant of the liquid pipe 26 may be divided,and thus, some of the divided refrigerant may flow towards the valveliquid inlet port and into the chiller 10, and some other refrigerantmay flow towards the suction pipe 8. The internal refrigerant of theliquid pipe 26 flowing into the chiller 10 may be circulated in thechiller 10 and heat-exchanged to cool coolant for cooling the battery inthe chiller 10. This refrigerant may then be discharged to the outsideof the chiller 10 via the refrigerant outlet port 16.

From before the transmitting of the turn-on signal to the chiller 10 andup to the discharging of the internal refrigerant of the liquid pipe 26to the outside of the chiller 10 via the refrigerant outlet port 16, theinternal refrigerant of the suction pipe 8, which passes sequentiallythrough the chiller suction inlet port 12 and the refrigerant outletport 16, may flow into the chiller 10. In the discharging of theinternal refrigerant of the liquid pipe 26 to the outside of the chiller10 via the refrigerant outlet port 16, the internal refrigerant of theliquid pipe 26 may be coalesced with the internal refrigerant of thesuction pipe 8 in the chiller 10 and then may be discharged to theoutside of the chiller 10, and the internal refrigerant of the liquidpipe 26 discharged to the outside of the chiller 10 may flow into thecompressor 4.

Since the internal refrigerant of the suction pipe 8 always passesthrough the inside of the chiller 10 regardless whether the chiller 10is turned-on or turned-off, when the battery cooling condition is in amild state, it may be possible to cool the battery using the internalrefrigerant of the suction pipe 8 without dividing the internalrefrigerant of the liquid pipe 26 and flowing into the chiller 10.Therefore, it may be possible to prevent a problem in which indoor spacecooling performance is deteriorated due to a sudden change in the flowamount distribution of the refrigerant, which has been a problem in theair conditioner system in which the internal refrigerant of the existingliquid pipe is divided to cool the battery.

In addition, by integrally forming the refrigerant circuit of theexisting air conditioner system for cooling the vehicle indoor spacecooling with the refrigerant circuit for the chiller, which has beenbranched from the refrigerant circuit of the air conditioner system andfurther connected for cooling the battery, the structure of the systemmay be simplified to optimize the inner space of an engine compartment,thereby reducing the cost and weight, and improving the ability to beassembled.

The exemplary embodiments of the water-cooling type battery coolingsystem and the cooling method using the same of the present disclosuredescribed above are merely illustrative, and those ordinary skilled inthe art to which the present disclosure may well-know that that variousmodifications and equivalent other exemplary embodiments may be madefrom the above embodiments. Therefore, it may be well understood thatthe present disclosure is not limited to only the form set forth in theforegoing description. Accordingly, the true scope of the presentdisclosure should be determined by the technical spirit of the appendedclaims. In addition, it is should be understood that the presentdisclosure includes all modifications, equivalents, and substitutesfalling within the spirit and scope of the present disclosure defined bythe appended claims.

1.-14. (canceled)
 15. A cooling method using a water-cooling typebattery cooling system, comprising: transmitting, by a controller, aturn-on signal to a chiller configured to cool a battery; opening, bythe controller, a valve liquid inlet port by operation of a solenoidvalve mounted in a thermostatic expansion valve for the chiller;dividing, by the controller, an internal refrigerant of a liquid pipe toallow a first portion of divided refrigerant to be directed towards thevalve liquid inlet port and to flow into the chiller; circulating, bythe controller, the internal refrigerant of the liquid pipe flowing intothe chiller to be heat-exchanged and to cool coolant for the battery inthe chiller; and discharging, by the controller, the internalrefrigerant of the liquid pipe, which has cooled coolant for the batteryin the chiller, via a refrigerant discharge port.
 16. The cooling methodusing the water-cooling type battery cooling system of claim 15, whereinfrom before transmitting the turn-on signal to the chiller and up todischarging the internal refrigerant of the liquid pipe to the outsideof the chiller via the refrigerant outlet port, the internal refrigerantof the suction pipe, which passes sequentially through the chillersuction inlet port and the refrigerant outlet port, flows into thechiller.
 17. The cooling method using the water-cooling type batterycooling system of claim 15, wherein before transmitting the turn-onsignal to the chiller, the valve liquid inlet port is closed by thesolenoid valve.
 18. The cooling method using the water-cooling typebattery cooling system of claim 15, wherein before opening the valveliquid inlet port, the internal refrigerant of the liquid pipedischarged from a condenser flows towards the suction pipe connected toa second end of the liquid pipe.
 19. The cooling method using thewater-cooling type battery cooling system of claim 15, wherein indischarging the internal refrigerant of the liquid pipe to the outsideof the chiller via the refrigerant outlet port, the internal refrigerantof the liquid pipe is coalesced with the internal refrigerant of thesuction pipe in the chiller and is then discharged to the outside of thechiller.
 20. The cooling method using the water-cooling type batterycooling system of claim 15, wherein the internal refrigerant of theliquid pipe discharged to the outside of the chiller flows into acompressor.